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(1) In making their decisions, judges are bound by statutes and international treaties which form a part of the legal order; they are authorized to judge whether enactments other than statutes are in conformity with statutes or with such international treaties.
… (1993 Constitution, Art. 95)

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(3) Decisions of the Constitutional Court which declare, pursuant to Article 87 paragraph 2, that a treaty is not in conformity with the constitutional order, are an obstacle to the ratification of the treaty until such time as they are brought into conformity with each other. (1993 Constitution, Art. 89)

(1) The Constitutional Court has jurisdiction:
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i) to decide on the measures necessary to implement a decision of an international tribunal which is binding on the Czech Republic, in the event that it cannot be otherwise implemented;
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(2) Prior to the ratification of a treaty under Article 10a or Article 49, the Constitutional Court shall further have jurisdiction to decide concerning the treaty’s conformity with the constitutional order. A treaty may not be ratified prior to the Constitutional Court giving judgment.
… (1993 Constitution, Art. 87)

Promulgated treaties, to the ratification of which Parliament has given its consent and by which the Czech Republic is bound, form a part of the legal order; if a treaty provides something other than that which a statute provides, the treaty shall apply. (1993 Constitution, Art. 10)

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(2) The Czech Republic shall observe its obligations resulting from international law. (1993 Constitution, Art. 1)